I think if you read Chaos Monkeys and/or Dragnet Nation (and I'm sure, others) you'll realize the data privacy cat is out of the bag. It's likely such ISP data to be sold is already available via other channels.

Aside from that, the danger of the internet doesn't seem to be free speech, but free thought. The bar is much higher and deeper. Droves are being manipulated, nudged and misled. That's happening, nearly frictionless, now. Even Orwell would blush thinking, "My, I really underestimated what was going to happen."

Mind you a lack of NN isn't going to help. But with NN or without NN the root issue(s) aren't NN.